diff --git a/src/proto/misc2.pro b/src/proto/misc2.pro
index 3fa0c9b..671bd9f 100644
--- a/src/proto/misc2.pro
+++ b/src/proto/misc2.pro
@@ -53,6 +53,7 @@
 void ga_init __ARGS((garray_T *gap));
 void ga_init2 __ARGS((garray_T *gap, int itemsize, int growsize));
 int ga_grow __ARGS((garray_T *gap, int n));
+char_u *ga_concat_strings __ARGS((garray_T *gap));
 void ga_concat __ARGS((garray_T *gap, char_u *s));
 void ga_append __ARGS((garray_T *gap, int c));
 int name_to_mod_mask __ARGS((int c));